Ahh, as water flows from rivers to seas, it picks up small amounts of mineral salts from the rocks and soil of the river beds. The water in the oceans only leaves by evaporating, but the salt remains dissolved in the ocean - it does not evaporate. So the remaining water gets more and more salty as time passes.

And If all the oceans were fresh, well, life would not exist, simple as that, because water soluble salts would not exist on the planet, and about 75% of a human's body mass is a saline(salt content) solution

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Salt can also get taken out of the system in hot dry salt pans that then get buried - a good example would be the dead sea - the results of these have produced huge salt domes under the north sea which have created a lot of the oil traps there.

So the sea will not necessarily get saltier with time, it depends whether more salt is being erroded out or is being put down by evaporation...

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